timestamps

• 0:00

  Introduction to Abiotic Signaling

• 0:31

  Cell Signaling Reminder

• 1:01

  Signaling Categories

• 1:33

  Plasmodesmata and Direct Contact

• 2:04

  Examples of Plant Responses

• 2:35

  Phytochromes and Light Detection

• 3:39

  Red and Far-Red Light

• 4:10

  Phototropism Overview

• 5:11

  Darwin's Experiment Setup

• 6:13

  Experiment Results Analysis

• 8:16

  Boysen-Jensen Experiment

• 9:19

  Permeable vs Impermeable Barriers

• 10:20

  Hormone Identification

• 11:54

  Long-Distance Signaling

• 12:56

  Auxin and Cell Elongation

• 15:32

  Phytochrome Inactivation

• 17:37

  Photoperiodism Introduction

• 18:37

  Short Day and Long Day Plants

• 20:11

  Light Interruption Experiments

• 21:48

  Evolutionary Benefits

• 22:51

  Seed Germination Hormones

• 24:26

  Abscisic Acid and Dormancy

• 26:34

  Fruit Ripening and Ethylene

• 28:41

  Seed Dispersal Importance

• 30:14

  Gravitropism Response

• 32:17

  Seed Orientation Examples

• 33:51

  Practice Problems Introduction

• 37:10

  Question 1 Analysis

• 38:12

  Question 2 Explanation

• 39:46

  Question 3 Discussion

• 41:19

  Student Questions Answered

• 42:51

  Phototropism Application Questions

• 44:32

  Experiment Next Steps

• 47:08

  Short Day Plants Question

• 48:14

  Wrap Up and Next Topics